Browse Prior Art Database

Motor Drive and Control Circuit

IP.com Disclosure Number: IPCOM000095714D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

West, DL: AUTHOR

Abstract

The circuit is for use with a stepping motor of a type such as the S/LO SYN* which requires two consecutive pulses of opposite polarity to cause the armature to step. The circuit does not require a high capacity DC stepping pulse source. It has the additional advantage of being readily adjustable insofar as stepping speeds are concerned. *S/LO SYN is a trademark of Superior Electric Co.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 71% of the total text.

Page 1 of 2

Motor Drive and Control Circuit

The circuit is for use with a stepping motor of a type such as the S/LO SYN* which requires two consecutive pulses of opposite polarity to cause the armature to step. The circuit does not require a high capacity DC stepping pulse source. It has the additional advantage of being readily adjustable insofar as stepping speeds are concerned. *S/LO SYN is a trademark of Superior Electric Co.

The circuit operates as follows. AC power is applied to transformer 10. Full wave rectified current of either polarity may be applied to motor 12 by turning on the proper silicon controlled rectifier 14 or 16. Alternate polarity pulses can be obtained by alternately gating 14 and 16. This is accomplished by alternately operating gate transistors 18 and 20. These continuously receive full wave pulses from saturable transformer 22. These pulses are passed by the transistor, i. e., 18 or 20, that is currently in its conducting state to the isolation transformers 24 or 26 and subsequently to the associated rectifier 14 or 16.

Transistors 18 and 20 are alternately turned off and on by the transistor multivibrator circuit comprised of transistors 28 and 30. The frequency of the multivibrator is determined by capacitors 32 and 34. Hence, the stepping rate of the motor is controlled by the size of these capacitors. The multivibrator circuit is initially started by opening contact 36 and stopped by closing the same contact. The opening and closing of contact...